projectPoint関数
リファレンスの説明と例は英語です。見出しと目次は日本語です。
Where a longitude and latitude (in degrees) fall on the map's canvas, as [x, y]; null for a map whose canvas
cannot be reversed from here. On the world a point just east of the seam is at the far left of the canvas and one just
west of it at the far right, and the canvas repeats either side, so a page that pans past the edge adds or takes away
width (wrapAcross).
インポート
import { projectPoint } from "@johnmorrisdotca/chizu";定義
function projectPoint(map: Pick<ChizuMap, "projection">, lon: number, lat: number): [number, number] | null引数
| 名前 | 型 | 説明 |
|---|---|---|
map | Pick<ChizuMap, "projection"> | The native map or map fields required by this signature; coordinates and region codes belong to its canvas. |
lon | number | Longitude in degrees, in [longitude, latitude] order. |
lat | number | Latitude in degrees, in [longitude, latitude] order. |
戻り値
[number, number] | null
The native [x, y] point, or null when the map’s projection is not reversible here.
例
import WORLD from "@johnmorrisdotca/chizu/world";
import { projectPoint } from "@johnmorrisdotca/chizu";
const tokyo = projectPoint(WORLD, 139.69, 35.69)!;
console.log(tokyo.map((value) => value.toFixed(1)).join(", "));
// 457.5, 212.5457.5, 212.5出力（このページを作ったときに実行した結果）
この日本語は、まだ日本語を母語とする方の確認を受けていません。訂正を歓迎します。